The line "I'm not Steve Rogers" was actually a big statement after Ross calling Sam son--but it was removed. Sam's speech about having to the be the best and not make any mistakes was an important scene that was undermined by Bucky and Sam making a joke about being "dramatic". Those were the two most important political scenes in the movie and all it really needed and they still fucked it up.
And if they'd done that we'd get the usual suspects saying "Oh give me a break, that's such an exaggeration!"
The movie could have made more of a statement about the governments fighting for the rare mineral on Celestial Island, but that should have been Vibranium, not Adamantium, because we've already established in Wakanda Forever that that is a political issue in the Marvel world right now.
If it was Vibranium then the Wakandans or Talokan would be all over it, making it a new substance alters the balance of global power and sets the stage for future conflicts and expands the world.
This is why I have an issue with Feige. It is his job to make sure all these pieces fit together and he's totally messed that up, first with Secret Invasion and now this.
Secret Invasion set up how Ross became President to start with.